Why would some people set strange ringtones for their mobile phones?

I can understand if it’s a ringtone like music or any default ringtone but there’s this middle aged lady at work whenever her phone rings it gave out a strange sound then she answered the call as if it was normal lol I was laughing so hard. The ringtone isn’t Chinese or other language it’s like a childish alien language it goes like this:

Ringtone: « Knee bah sue sue sue sue sue sue Poh pui Poh Poh pui knee bah nya? Nya nya nya »

I was like wtf lol. Even my colleague said she was weird for liking the ringtone. She has been using that same ringtone for months.
Why would some people set strange ringtones for their mobile phones?
Post Opinion